Multiple twist spindles



Sept. 24, 1968 -r z ET AL 3,402,545

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MULTIPLE TWIST SPINDLES Filed April 5, 1967 5 Sheets-Sheet 5 W W i w mm 79 j I ll 3 mfrzn'ron s United States Patent 3,402,545 MULTIPLE TWIST SPINDLES Klaus Nimtz, Krefeld, and Gustav Franzen, Neersen, near Krefeld, Germany, assignors to Palitex Project-Company G.m.b.H., Krefeld, Germany Filed Apr. 3, 1967, Ser. No. 628,008 Claims priority, application Germany, Apr. 7, 1966, P 39,164; Mar. 15, 1967, P 41,643 6 Claims. (Cl. 5758.49)

ABSTRACT OF THE DISCLOSURE The present invention relates to a multiple twist spindle, especially a two-for-one twisting spindle, which comprises a spindle rotor, a bobbin carrier supported by said spindle rotor and adapted to be held stationary relative thereto and in which said bobbin carrier is composed of a lower section and an upper section adapted to be withdrawn from said lower section. The invention is characterized primarily in that the lower bobbin carrier section is provided with a hollow central bearing stud adapted detachably to receive a plug sleeve on the upper bobbin carrier section while the said hollow stud is rotatably supported by conical roller means which are upwardly and radially outwardly covered by the bobbin carrier lower section, so that the bearing means of the lower bobbin carrier section remain covered when the bobbin carrier upper section is withdrawn.

The present invention relates to multiple twist spindles, especially two-for-one twisting spindles, with a bobbin carrier which is equipped with a protective pot and which is journalled on the spindle rotor. The said bobbin carrier is adapted to be lifted off axially from the spindle rotor and is adapted to be held stationary while being journalled by means of conical rollers, the axes of which are inclined with regard to the spindle axis and which are located between a bearing stud and the spindle rotor.

Such multiple twist spindle has been disclosed in applicants copending application Ser. No. 600,987 filed Dec. 12, 1966, and more specifically in FIGS. 2 and 4 thereof. The most important advantage of the multiple twist spindle disclosed in the said copending application consists in that the resting portion of the spindle, i.e. that portion of the spindle which does not rotate with the spindle rotor, can be lifted ofr the spindle rotor so that the bearing means, namely, the conical rollers are exposed and can be serviced, for instance, be lubricated without difliculties.

Moreover, the lifting of the bobbin carrier off the spindle rotor facilitates the threading of the thread, inasmuch as the threading can be carried out independently of the spindle rotor, and as the case may be, outside the machine after the bobbin carrier with the delivery bobbin has been lifted otf. If, as has been suggested, the thread storage disc is slotted, the thread passed therethrough can when mounting the bobbin carrier be drawn radially outwardly and can be drawn upwardly around the delivery bobbin carrier with the delivery bobbin and can then be pieced to the winding-up bobbin.

This faciltating of the threading operation for the thread is of particular importance with such spindles with which an automation of the exchange of the delivery bobbin and the threading operation is provided.

According to the suggestion set forth in the above mentioned copending application, the portions of the bobbin carrier to be lifted off are relatively large and, furthermore, when effecting this lifting off operation, the bearing area is exposed and might get soiled.

It is, therefore, an object of the present invention 3,402,545 Patented Sept. 24, 1968 further to improve the delivery bobbin carrier of the arrangement set forth in the above mentioned copending application so that when lifting off the bobbin carrier, the bearing means stay together unchanged and remain covered.

It is another object of this invention to provide a multiple twist spin-dle in which that portion which is to be lifted off the spindle rotor together with the delivery bobbin will have relatively small dimensions and thus a low weight.

These and other objects and advantages of the invention will appear more clearly from the following specification, in connection with the accompanying drawings, in which:

FIGURE 1 is a partial section through a two-for-one twisting spindle with a two-part bobbin carrier.

FIGURE 1a illustrates partially in view and partially in section the lower portion of the bobbin carrier within the range of the bearing stud with an undulated thread passage or slot.

FIGURE 2 is a partial section through a modified twofor-one twisting spindle with a two-part bobbin carrier.

FIGURE 2a shows partially in section and partially in View a cutout of the overflow dish with slotted hollow bearing stud.

FIGURE 2b is 'a section along the line IIb-IIb of FIG. 2.

FIGURE 20 shows the arrangement of the contacts for the current supply to a magnetically adjustable thread brake.

FIGURE 3 is a partial section through a two-for-one twisting spindle with a two-part bobbin carrier, the lower portion of which forms a protective pot extending over the entire height of the delivery bobbin.

FIGURE 4 is a perspective view of the upper end of the thread passage or slot in the protective pot wall of the lower part of the bobbin carrier.

FIGURE 5 is a partial section through a two-for-one twisting spindle with a thread sliding ring which is placed upon the upper edge of the protective pot and which can be lifted off the upper portion of the bobbin carrier.

FIGURE 6 shows the two-for-one twisting spindle of FIG. 5 as seen from the slotted side.

The multiple twisting spindle according to the present invention is characterized in that the bobbin carrier comprises a lower part which is provided with a thread passage -and covers the conical rollers toward the top and radially toward the outside, and furthermore comprises an upper part which, by means of an axially extending plug sleeve is detachably plugged into the bearing stud extending between the conical rollers, said bearing stud having a continuous thread passage slot extending in the longitudinal direction of said stud.

The problem underlying the present invention has been satisfactorily solved by the arrangement of the bobbin carrier as a two-part bobbin carrier, because the lower part of the bobbin carrier can remain on the spindle rotor when an exchange of the delivery bobbin is to be effected, while also the conical rollers forming the bearing remain surrounded and covered by the lower part of the bobbin carrier.

When during an exchange of the delivery bobbin, the upper portion of the bobbin carrier with delivery bobbin is detached from the lower part of the bobbin carrier, it is possible to withdraw the thread, for instance, outside of the machine from the slipped-on new delivery bobbin and to pass said withdrawn thread through the hollow upper part of the bobbin carrier. Thereupon, the thread is passed outwardly and around the delivery bobbin or bobbin carrier and later on after passing a thread guiding ear is pieced onto the winding up bobbin.

When placing the thus prepared upper part of the bobbin carrier onto the lower part of the bobbin carrier, the thread is pulled through the slotted bearing stud between two conical rollers toward the outside and will move also through the slotted overrunning dish of the spindle rotor toward the outside so that during a later rotation of the spindle, the thread will be in the form of -a balloon to circulate about the entire unit.

More specifically, the lower part of the bobbin carrier may be designed in the form of a pot, the Wall of which extends around the upper part of the bobbin carrier which is designed as a protective pot for the delivery bobbin, said pot wall extending up to a partial height of said upper part and carrying holding magnets while its marginal portion extends below a radially protruding step of the upper part of the bobbin carrier.

According to another embodiment of the invention, the reverse arrangement may be employed according to which the lower part of the bobbin carrier is designed as protective pot for the delivery bobbin whereas the thread passage slot extending along the wall of the pot will at its upper marginal portion run out at an angle, and the marginal portion of the pot wall which extends over the slot end is slightly arched and extends inwardly.

While in the first mentioned instance the upper bobbin carrier part which is formed as a protective pot has a closed round pot rim, in the second instance there is required a thread passage slot which extends to the upper marginal portion of the protective pot wall. The angle shape of the thread passage slot at the upper marginal portion in conformity with the present invention Will assure that the thread when circulating in the form of a balloon, especially during the start of the spindle when the thread contacts the marginal portion of the top wall will not get snagged in the thread passage slot which might otherwise bring about a thread break.

If the upper part of the bobbin carrier of the delivery bobbin is located inside the protective pot of the lower part of the bobbin carrier, the thread sliding ring is mounted on the edge of the protective pot wall and at the top bridges the thread passage slot so that the thread rotating in the form of a balloon cannot enter the thread passage slot. Since, on the other hand, the pull through of the thread requires a continuous slot in the protective pot, the latter will when lifting off the upper part of the bobbin carrier be freed from the lower part of the bobbin carrier inasmuch as the thread sliding ring is lifted 01f.

Thus, when inserting the upper part of the bobbin carrier with delivery bobbin, the thread can be pulled through the slot whereup the slot is bridged at the upper marginal portion of the protective pot by mounting the thread sliding ring. It will be appreciated that the protective pot marginal portion will detach the slide ring from the marginal portion of the lower pot of the bobbin carrier upper part when the latter is inserted.

Referring now to the drawing in detail, the spindle rotor throughout the various embodiments shown in the drawings comprises a whorl 1 with a thread storage disc 2 and a slotted overflow disc 3.

In conformity with the embodiment shown in FIG, 1, the spindle rotor comprises conical rollers 4 which by means of pivots 5 are freely rotatably journalled in said spindle rotor. It is, of course, also possible to select the reverse arrangement according to which the conical rollers are freely rotatably journalled in the bobbin carrier and more specifically in the bottom portion thereof. Such an arrangement is shown for instance in FIG. 2 of the above mentioned copending application.

The conical rollers 4 form a closed bearing for the bearing stud 6 which latter forms a part of the lower portion 7 of the bobbin carrier. Said lower part 7 has a pot shape and extends approximately up to half the height of the delivery bobbin 15. The bobbin carrier lower part 7 at the same time surrounds the lower portion of the protective pot S which latter forms a part of the bobbin carrier upper part 14. As will be seen from the drawing, bobbin carrier part 14 forms a hollow shaft. On the nner side of the protective pot of the lower part 7 there are provided holding magnets 9 which in a manner known per se, are adapted to hold the two part bobbin carrier at rest at least with regard to the rotating spindle rotor. To this end, there are provided counter magnets (not shown) for cooperation with the holding magnets 9, said counter magnets being arranged stationarily. As will also be seen from the drawing, the bobbin carrier upper part 8 has a radially protruding step which extends over the upper rim of the lower part 7 of the bobbin carrier. Between the lower part 7 of the bobbin carrier and the protective pot 8 of the upper portion 14 of the bobbin carrier there is provided a free space or chamber 10 which is adapted to receive control means for a thread brake or a fiyer brake. In the particular embodiment shown in FIG. 1, a thread brake 11 is arranged in the thread intake tube 12 which latter is axially inserted into the bobbin carrier upper part 14. The bobbin carrier upper part 14 has slipped thereon the delivery bobbin 15 in a manner known per se.

The upper part 14 of the bobbin carrier is by means of the sleeve plug 13 inserted into the hollow bearing stud 16 and is detachably located therein.

After the thread has been withdrawn from the delivery bobbin 15 and the empty bobbin is to be replaced by a new delivery bobbin, the upper part 14 of the bobbin carrier together with the protective pot 8 and the empty delivery bobbin 15 is detached and withdrawn from the lower part 7 of the bobbin carrier to which end the sleeve plug 13 is axially pulled out of the bearing stud 6. The bobbin carrier lower part 7 remains on the spindle rotor 1. Thus the conical rollers 4 remain at their respective places and remain surrounded by the lower part 7 so that a soiling of the bearing cannot occur when the upper part 14 of the bobbin carrier has been lifted off.

The threading of the thread w hen inserting the bobbin carrier upper part 14 with a new delivery bobbin 15 requires as mentioned the slot 16 in the bearing stud 6. This threading slot may in conformity with FIG. 111 be of an undulated contour in order to assure that the conical roller 6 will always find a supporting section so that during the rotation of the spindle rotor no shocks will occur when the rollers pass over the slot. It will be evident that instead of the undulated or serpentine slot 16, a straight slot could be used which is inclined with regard to the axis of rotation of the roller 6.

FIG. 2 shows an embodiment which corresponds as to the major details to that of the embodiment of FIG. 1. However, in contrast to FIG. 1, the plug sleeve 6a in FIG. 2 forms an integral part of the overflow dish 3 or the spindle rotor 1. The lower part 7 of the bobbin carrier is again in the shape of a pot and is carried by the conical rollers 4 of the plug hearing. The pivots 5a of the conical rollers 4 are connected to a hub portion 18 of the bobbin carrier lower part 7.

According to FIG. 2b, an annular gap 17 is provided between the hollow bearing stud 6a and the plug sleeve 13a because one part is at a standstill while the other part rotates. In order to bring about a centering, the hub portion 18 of the lower part 7 of the bobbin carrier is provided with a conical surface 19 into which fits a corresponding conical surface of the upper portion 14 of the bobbin carrier.

The embodiment of FIG. 2 comprises a thread brake 20 which is equipped with an exciting coil 21 adapted to adjust the braking force of the thread brake. The Electric conductors are connected to contacts 22 the specific design of which is shown on a larger scale in FIG. 20. As will be seen from the drawing, the said contacts 22 are spring-biased by springs 22a. The said spring-urged contacts 22 are adapted to act through contact plates 23 which are arranged in the hub portion 18 of the lower part 7 of the bobbin carrier.

According to the embodiment of FIG. 3, the lower bobbin carrier part forms a protective pot 7a, 8a which is provided with a threading slot 24 the upper end of which ends approximately at the upper end of the angledotf portion 25 as shown in FIG. 4. The leftwardly (with regard to the drawing) directed tip of the marginal portion of the pot wall 7a is curved slightly inwardly and extends over the upper slot end. In this way it will be assured that the thread which when starting the spindle moves along the top edge will not slip into the slot end and thus will be unable to snag. Instead, with either direction of rotation the thread will pass over said slot end. The slot 24 in the protective pot 7a, 8a has associated therewith a slot 29 in the overflow dish 3. The threading of the thread requires that during the standstill of the spindle the slots 24 and 29 are aligned with each other which situation can be brought about automatically by provisions on the spindle brake (not shown). This also applies to the embodiments of FIGS. 1 and 2. The protective pot forming the lower part of the bobbin carrier has its bottom 8a provided with an axially directed hollow bearing stud 6 similar to that of FIG. la. The hollow stud 6 is provided with a slot 16 which follows the slot 24 in the bottom 8a of the protective pot. By means of the outwardly conical bearing stud 6 at the bottom 8a, the lower bobbin carrier part extends between the three conical rollers 4 which are arranged symmetrically with regard to the spindle axis and which, similar to the embodirnents described above by means of antifriction bearings (not shown) are journalled on the bearing pivots 5a connected to the spindle rotor.

In a nonillustrated manner but corresponding to FIGS. 1 and 2, the protective pot wall 7a is approximately within the range of its largest bulging area provided with holding magnets having associated therewith counter magnets arranged radially outwardly so that by means of said magnets the bobbin carrier lower part will be prevented from rotating when whorl 1 and thread storage disc 2 rotate. Also, the upper part 14 of the bobbin carrier upon which the delivery bobbin is slipped and the sleeve of which rests at its lower end on the annular flange 26, is at a standstill with the bobbin carrier lower part when the spindle rotor rotates. The upper part 14 by means of the plug sleeve 13 detachably inserted into the bearing stud 6 around which the conical rollers 4 rotate.

The bobbin carrier lower part 7a, 8a covers by means of its bottom portion 8a the conical rollers 4 toward the top and in cooperation with the overflow dish 3 also covers the conical rollers 4 radially outwardly. For purposes of lubricating the bearing and cleaning the same the bobbin carrier lower part together with the upper part 14 can be lifted upwardly.

If, however, it is intended merely to exchange the delivery bobbin 15 and to thread the thread, it is suflicient to lift the bobbin carrier upper part 14 alone, in which instance the plug sleeve 13 will be pulled out of the hearing stud 6. It is possible without difficulty outside to thread the thread through the bobbin carrier upper part 14, independently of the spindle rotor and the bobbin carrier lower part 7a, 8a.

When inserting the bobibn carrier upper part 14 with the delivery bobbin 15, the thread is passed through slot 16 of the bearing stud 6 and through the slots 24 and 29 of the protective pot 7a, 8a and the overflow dish 3 so that the spindle is again ready for the twisting operation as soon as the thread has been passed to the Winding-up bobbin (not shown).

According to the embodiments of FIGS. 5 and 6, the bobbin carrier upper part 14 instead of being provided with the annular flange 26 is provided with the lower pot 26a. The diameter of pot 26a is so dimensioned that the upper pot edge 27 will, when axially withdrawing the bobbin carrier upper part 14 from the lower bobbin carrier part 7a, 8a engage from below the thread sliding ring 28 and lift the latter off the pot wall 7a. This is illustrated in FIG. 5 by dot-dash lines. The thread sliding ring 28 has a U-shaped cross section while the inner leg 28a extends over the edge of the protective pot wall 7a inwardly to such an extent that the marginal portion 27 of the pot of the bobbin carrier upper part 14 will be able to extend between legs 28a and the upper edge of the pot wall 7a.

The thread sliding ring 28 which may consist of synthetic material, bridges the conically upwardly widening thread slot 24a in the protective pot wall 7a in conformity with FIG. 6 so that the thread which in the form of a balloon circulates about the bobbin carrier lower part 7a, 8a cannot snag in slot 24a. This conical widening of the slot 24a facilitates the threading operation.

When a new full delivery bobbin 15 by means of the bobbin carrier upper part 14 is placed in the protective pot 7a, 8a the thread sliding ring 28 will be seated upon the upper edge of the protective pot wall 7a and will bridge slot 24a.

The two-for-one twisting spindle as shown in the drawings, makes possible an exchange of the delivery bobbin 15 together with the bobbin carrier upper part 14 while the protective pot 7a, 8a remains at its respective place and thus the body to be withdrawn or to be inserted will not materially exceed the weight of the delivery bobbin 15. This reduction in weight is, with the embodiments of FIGS. 5 and 6 still considerably greater than with the embodiments of FIGS. 1 and 2, according to which the entire protective pot which surrounds the delivery bobbin and pertains to the bobbin carrier upper part has to be lifted 0E.

The fact that the bobbin carrier is composed of two parts which are detachable from each other assures that the bearing wheel during the exchange of the delivery bobbin remains closed on all sides. On the other hand the possibility of lifting off the bobbin carrier as an entity for purposes of servicing the bearing is still maintained.

It is, of course, to be understood that the present invention is, by no means, limited to the particular embodiments shown in the drawings, but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. A mutliple twist spindle, especially two-for-one twisting spindle which includes a spindle rotor, a bobbin carrier supported by said spindle rotor and adapted to be held stationary relative thereto, said bobbin carrier being provided with a protective pot and comprising a lower section with a hollow central bearing stud and with a threading slot, and conical roller means rotatably supporting said bearing stud and being upwardly and radially outwardly covered by said bobbin carrier lower section, said bobbin carrier also comprising a upper section with a plug sleeve extendingin the axial direction of said upper section and adapted selectively and detachably to be inserted into said hollow bearing stud, said bearing stud having a threading slot extending in the longitudinal direction of said stud.

2. A spindle according to claim 1, in which the protective pot of the bobbin carrier forms a part of said upper section and has its circumferential portion between the upper and lower end thereof provided with a flangeshaped step, and in which said bobbin carrier lower section is pot-shaped and has its circumferential wall extending around the lower portion of said protective pot with the upper edge of said circumferential wall in engagement with said flange-shaped step.

3. A spindle according to claim 2, which includes holding magnet means supported by the circumferential wall of said pot-shaped lower section.

4. A spindle according to claim 1, in which the protective pot of the bobbin carrier forms a part of the bobbin carrier lower section and has its circumferential wall provided with a threading slot extending in the longitudinal direction of said circumferential wall and having the edge at the upper end of said slot angled off, said edge overlapping the adjacent end of said slot and being slight ly curved inwardly.

5. A spindle according to claim 1, in which the protective pot of the bobbin carrier forms a part of said lower bobbin carrier section and which includes a thread sliding ring of a U-shaped cross section axially detachably mounted on the upper edge of said protective pot.

6. A spindle according to claim 5, in which the inner leg of said cross sectionally U-shaped thread sliding ring extends over the upper edge of said protective pot in radially spaced relationship thereto, and in which the lower end of said upper bobbin carrier section is provided with a flat pan having an outer peripheral wall of a diameter slightly less than the inner diameter of the outer leg of said thread sliding ring to thereby permit said pan in response to a withdrawal operation of said upper bobbin carrier section to enter said sliding ring be- References Cited UNITED STATES PATENTS 2,625,786 1/1953 Klein 57 5s.49 2,692,471 10/1954 Landolt 57-52;.49 10 2,693,074 11/1954 Bochman 57-58.83

FOREIGN PATENTS 992,909 5/1965 Great Britain.

15 FRANK J. COHEN, Primary Examiner.

WERNER H. SCHROEDER, Assistant Examiner. 

